Thanks...hadn't thought of BUF as an option...checking Expedia, ITN and TCook, it's also at least £100 less expensive using US Airways or Continental , surprise, surprise! Also checked with Avis London....going into Canada they just need advice and provide some kind of insurance document, (they say at no extra cost). I think this ties in with what I remember a couple of years back when we drove from Seattle up to Vancouver...anyway, thanks for the welcome advice.